SU961088A1 - Multimotor electric drive - Google Patents

Description

(54) MULTI-MOTOR ELECTRIC DRIVE

one

The invention relates to electrical engineering and can be used on an electric rolling stock with direct current motors powered by a DC network.

Devices are known for controlling the speed of rotation of DC motors, consisting of operating and switching thyristors, reverse and discharge diodes, switching capacitors and reactor ij.

The closest to the technical essence of the invention is a multi-motor electric drive containing direct current electric motors, the main winding of each electric motor is driven by a reverse diode and connected through a series-connected switching and working thyristors to a power source, switching thyristors are bypassed by a reverse diode, the anodes of which are connected through sequentially connected switching capacitor and reactor 2.

A disadvantage of the known devices is the dependence of the voltage on the com, mutated capacitor on the load current, which causes an increase in the mass and size of the converter.

The goal of izofeteniya is to reduce the mass and size of indicators for 10 by counting the weakening of the voltage on the switching capacitor on the load current.

Delivered del is achieved by the addition of a series connected auxiliary thyristor and a reactor to the device, the output of the auxiliary reactor is connected to the negative terminal of the power source, and the cathode of the auxiliary thyristor is connected to the common point of the capacitor and the reactor.

Claims (2)

The drawing shows the scheme before; Laggami device. 9 A multi-drive electric drive contains two electric motors 1 and 2, the main winding of each of the shuntyrian electric motors by reverse diodes 3 and 4, the anchor windings of the electric motors 1 and 2, respectively, are connected through serially connected switching thyristor 5, working thyristor 6 and switching thyristor 7, working thyristor 8 power source 9. Switching thyristors 5 and 7 are bridged by reverse diodes 10 and 11, the anodes of which are connected through serially connected switching capacitor 12 and reactor 13. The electric drive contains sequentially connected auxiliary reactors 14 and thyristor 15, the cathode of which is connected to the common point of switching capacitor 12 and reactor 13, and the free output of the auxiliary reactor is connected to the negative terminal of the power supply 9. The drive operates as follows. 0 When the thyristors 5 and 6 are open, the current flows from the power source 9 through the indicated elements and the traction electrode; ga 1, switching capacitor 12 is zakonoken to the polarity indicated on the drawing without brackets. After the control signal is transferred to the switching thyristor 7, an oscillating recharge of the switching capacitor 12 occurs along the circuit: plus capacitor 12 reactor 13 - diode 10 - thyristor 7 minus capacitor 12, which leads to locking the switching thyristor 5, followed by looping along the circuit: source 9 - thyristor 7 - capacitor 12 - reactor 13 - thyristor 6 - eleutr motor 1 - source 9. The voltage on the switching capacitor is indicated in brackets in the drawing. Current traction motor; 9 flows through the reverse diode 11. When the thyristors 7 and 8 are unlocked, the current flows from the power source 9 through the indicated elements and traction electrode gage 2. In order to lock the thyristor. It is necessary to apply control signals to thyristors 5 and 15. Two circuits are formed: plus capacitor 12 - diode 11 - thyristor 5 reactor 13 - minus capacitor 12 and plus capacitor 12 - diode 11 g source 9 - reactor 14 - thyristor 15 84 minus capacitor 12, in the current flow interval through which the ventuil properties of the thyristor 7 are restored: part of the energy of the switching capacitor 12 will be transferred to the power supply 9. After the switching of the switching capacitor along the circuit: Source 9 - thyristor 5 - reactor 13 - capacitor 12 thyristor 8 - electric motor 2 - source 9, diode 4 is unlocked, through which the current of the traction motor will flow. 2. In subsequent cycles, the device operates in the same way. Since the energy from the commutator circuit is not transferred to the load, it is dissipated inside the circuit, a decrease. its quality factor also causes an improvement in weight and size parameters. V Thus, the technical and economic advantage of the device is a reduction in its mass and size parameters. The claims multiimpellent actuator comprising a DC motor, roots winding each elektrovdigateley schuvtirovana reflux diode and connected through respective series-connected switching and operating the thyristors to a power supply, commutating thyristors shunted freewheeling diodes, anodes of which are connected through a series-connected commutating capacitor and the reactor, characterized in that in order to reduce weight and size indicators, add to it Successively connected auxiliary thyristors and a reactor are entered, the auxiliary reactor is connected to the negative terminal of the power source, and the auxiliary thyristor cathode is connected to the common point of the switching capacitor and the reactor.-. Sources of information taken into account during the examination 1. Author's certificate USSR number 629612, CP. H 02 R 7/68, 1978. 2. Rosenfeld, V. Ye. Electric direct current trains with impulse converters. M., Transport, 1976, p. 33.